Oil & Gas
| Fri 29 May 2026
Beijing, May 30 -- PetroChina has filed a patent application for Gas Storage Gas Well Productivity Grading Method. This invention was developed by Wei Jin, Wu Yu, Liu Tuanhui, Chen Zhixin, Lu Jing, Ao Yuwei, Peng Li, Zhai Yujia, Zhao Jie, Wang Wei, Ma Zhihong, Wu Shaoshuang and Feng Haijun.
The patent application number is CN20..